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Posted by Leythos on December 10, 2004, 7:42 pm
If you were Registered and logged in, you could reply and use other advanced thread options > What is the generic rule to determine if an IP is internal only to a
> network or if it can be rerouted and pinged from outside ?
>
> Normally internal IPs are something like 10.0.0.x or 192.168.0.x, but
> I'm sure these ranges are not the only ones. I assume there is an
> agreed upon set that can be used internally. Is it all 10.x.x.x and
> all 192.x.x.x ? Are there more ?
>
> The whole thing was spawned by a friend's question whose office is
> using the unusual range of 192.9.200.x! Is this internal or external ?
Private IP Address Ranges
Class From To CIDR Mask Decimal Mask
Class "A" or 24 Bit 10.0.0.0 10.255.255.255/8 255.0.0.0
Class "B" or 20 Bit 172.16.0.0 172.31.255.255/12 or /16
255.240.0.0 or 255.255.0.0
Class "C" or 16 Bit 192.168.0.0 192.168.255.255/16 or /24
255.255.0.0 or 255.255.255.0
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